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Most health FSA plan years end on December 31, and whatever is left over usually goes back to your employer. To use it, confirm your plan's exact end date and your real balance, then spend it on qualified expenses incurred inside the plan year rather than paid for inside it.
Key Takeaways
- The deadline that matters is your plan year end, not the calendar year. For most people they are the same date, but not for everyone, and the difference is worth two minutes of checking.
- Leftover FSA money is generally forfeited. Your employer may offer a limited carryover or a short grace period, but a plan can only offer one of the two and plenty offer neither.
- A Health Savings Account is in no hurry at all. It rolls over, it belongs to you, and nothing about December applies to it.
- What counts is when the expense is incurred, not when the invoice is paid or when the item arrives. Buying on December 30 and taking delivery in January is normally fine; the reverse is not.
- A mattress and an adjustable base are dual-purpose items. Qualifying customers may use their FSA toward one, decided per customer through a short telehealth step at checkout, never per product.
- Leave yourself a week. The last few days of December are the worst possible time to discover your card balance is lower than you thought.
Why FSA money disappears and HSA money does not
These two accounts get spoken about as a pair, and for most of the year the difference barely matters. In November and December it is the only thing that matters.
What "use it or lose it" actually means
A Flexible Spending Account is funded by a salary reduction you elected during open enrolment. The money is set aside before tax, your employer administers it, and the deal is that it is meant to be spent on qualified medical expenses within the plan year. Whatever is still sitting there at the end is generally forfeited back to the plan. It is not a savings account and it does not follow you anywhere.
One quirk that works in your favour: the full annual election is usually available to you from the first day of the plan year, even though you are contributing to it a paycheque at a time. If you elected a larger amount than you have spent, the balance is genuinely there to use.
Carryover and grace periods
Employers can soften the edge in one of two ways. A carryover lets a limited amount roll into the next plan year. A grace period gives you extra time, up to two and a half months, to incur new expenses. A plan may offer one or the other, never both, and a plan is allowed to offer neither. There is also a separate thing called a run-out period, which only extends the time to submit claims for expenses you already incurred. It does not give you more time to shop.
Why an HSA is not in a hurry
A Health Savings Account rolls over indefinitely, belongs to you rather than your employer, and travels with you between jobs. If your account is an HSA, none of the urgency in this article applies. Read our guide to using an HSA or FSA to buy a mattress instead, and take the time to choose properly.
Step one: find your real deadline
Plan year end is not always December 31
Most health FSA plan years run with the calendar, but plenty of employers run a plan year that starts in July, or in October, or on the anniversary of the benefits renewal. If you have never checked, check. Everything else in this article hangs off that date.
Where to look it up
Your benefits portal states the plan year, the balance and whether a carryover or grace period applies, usually on the same screen. If you cannot find it, your HR or benefits contact can tell you in a sentence. Ask three things: when does the plan year end, how much is left, and does the plan have a carryover or a grace period.
Step two: check what is actually left
Look at the available balance in the plan portal rather than your memory of the election. Claims you submitted earlier in the year, reimbursements still processing and any mid-year change to your election all move the number. People are routinely out by a few hundred dollars in both directions, and the direction that hurts is discovering it at the till.
While you are in there, note the card you have been issued and whether it is still active. A card that expired quietly in the summer is a common and entirely avoidable December problem.
It is also worth knowing how your plan handles substantiation. Some administrators approve a card transaction at the point of sale and ask for documentation later; others hold it until they have seen paperwork. Neither approach changes what you are allowed to buy, but they feel very different on the day, and knowing which one you are dealing with stops a perfectly normal request for a receipt from reading like a refusal. If your administrator does ask, send the itemised receipt and the Letter of Medical Necessity together rather than one at a time.
Step three: decide what is actually worth buying
The point of this exercise is not to burn the balance on whatever is nearest. It is to bring forward something you genuinely need. Twelve sensible candidates, roughly in order of how much difference they make:
- Prescriptions and refills you will need in January anyway.
- The dental or vision work you have been postponing.
- New glasses, prescription sunglasses or a year of contact lenses.
- Physical therapy sessions already recommended to you.
- A follow-up appointment you keep moving.
- Braces, orthotics or supports a clinician has told you to wear.
- Blood pressure monitors and other home diagnostics.
- First aid and home medical supplies that will be used.
- Sleep equipment and supplies connected to a diagnosed condition.
- A sleep surface, where a clinician connects your condition to how you sleep.
- An adjustable base, where raising the head of the bed is part of the recommendation.
- Pillows and support products that keep that alignment in place.
What counts, and what quietly does not
Two shoppers can hold the same card and get different outcomes, because the rules work on two levels at once. The tax rules set the outer boundary of what a health account may pay for. Your employer's plan then sits inside that boundary and may be narrower still.
Always-qualified, dual-purpose, and not qualified
Some expenses are qualified on their face: prescriptions, co-pays, dental treatment, eye tests and lenses. Some are dual-purpose, meaning they qualify only when they are tied to a documented medical need, which is where mattresses and adjustable bases sit. And some things are simply not qualified however the case is argued. Knowing which of the three buckets you are in before you shop saves the awkward conversation at the payment screen.
Your employer's plan can be stricter than the tax rules
This is the part people miss. The general rules might permit something that your particular plan does not, and the plan wins. If a purchase matters to you, a two-minute call to the administrator beforehand is worth more than an hour of reading forums afterwards. Ask the question plainly: does my plan allow dual-purpose items with supporting documentation?
Mixed orders and sales tax
If one order contains both a qualifying item and something ordinary, the two are handled separately rather than the whole order being accepted or refused. Sales tax follows the item it belongs to. You do not have to calculate any of this yourself, but it does mean an itemised receipt is worth keeping, because the breakdown is what an administrator would eventually want to see.
Where a bed fits into end-of-year spending
A mattress is one of the few things on that list big enough to use a meaningful balance in a single purchase, which is exactly why it comes up every December. It is also the one with the most nonsense written about it, so here is the clean version.
Mattresses, and the medical reason
A mattress is dual-purpose. It can be a medical purchase or it can be furniture, and the determining factor is the documented reason, not the model. Chronic back pain, hip and shoulder pressure, reflux and apnea are the conditions that come up most often. Support, spinal alignment and pressure relief are the features that matter in that conversation; plushness and luxury are not. Our mattresses chosen for back pain relief are selected on exactly those grounds, and if you are not sure whether your mattress is the culprit, start with this guide to telling the difference.
Adjustable bases
Raising the head of the bed is a standard recommendation for reflux and for some breathing problems, which puts an adjustable base in the same dual-purpose category. If you are buying for an older parent, our guide to choosing an adjustable bed ranks the features by the ones that get used at two in the morning.
Pillows, protectors and the small items
If your balance is modest, this is where it goes furthest. A pillow at the wrong height undoes the alignment a good mattress is providing, and we fit pillows to your sleeping position in store rather than guessing. A mattress protector is the item people forget, and it is what keeps the warranty on the bed valid.
How the payment works at Mattress On Demand
We have partnered with Flex so qualifying customers can use their HSA or FSA to pay for products at checkout. Five steps, and the whole thing takes a few minutes:
- Choose the bed first, online or in a showroom, on how it fits your body.
- Select the HSA/FSA option at checkout. On some devices it sits behind "show more options".
- Confirm eligibility. Checkout hands you to Flex, which asks a short set of health questions.
- Enter the card your plan administrator issued you.
- Cover any difference with an ordinary card in the same checkout if the balance falls short.
Buying online
All of it happens in the browser. If you check out through an express wallet you may not see the option at all, because those wallets show their own payment list; checking out as a guest shows the full set.
Buying in the showroom
The same flow, on your own phone, with a Certified Sleep Science Coach beside you taking you through it. That is the part no online-only retailer can match in the last week of December: you lie on the bed, you decide, and the payment step happens while somebody who does it daily is standing there. You can read how our coaches are trained on the Certified Sleep Science Coaches page.
The timing traps that catch people in December
"Incurred" is about the purchase, not the payment
For an FSA, what matters is when the expense is incurred. Buying inside the plan year and taking delivery in January is normally fine. Ordering in January against last year's balance is not, no matter how willing everyone involved is to be helpful.
Delivery lead times
Delivery timing does not usually change eligibility, but it absolutely changes whether you are sleeping on the thing in January. Ask about the schedule before you pay; our delivery and pickup page covers how local delivery works, and the showroom team can give you real dates.
Two accounts in one household
If you and your partner both hold health accounts, you cannot split one purchase across both cards. One account pays the health side of the order, and an ordinary card covers anything left. It is worth deciding which account that will be before you are standing at the counter, particularly if one of them is an FSA with a deadline and the other is an HSA that can wait.
Leaving the telehealth step to December 31
The eligibility review is quick, but it is not instantaneous, and it depends on you answering questions properly rather than at speed in a car park. Give yourself a few days. The last week of the year is also the busiest week for the store, the delivery schedule and every benefits administrator in the country.
Showroom traffic in the last two weeks
December is busy for everyone, and the last ten days are the busiest stretch of the year on our floor. That matters less for browsing than for the part that needs attention: fitting a pillow to your sleeping position, spending fifteen unhurried minutes on two different firmness levels, and having a coach walk you through the payment step without a queue forming behind you. Booking a time is free, it takes a minute, and in late December it is the difference between a considered decision and a rushed one. If your schedule is tight, early mornings midweek are consistently the quietest hours in all three stores.
What if you do not qualify?
Then you pay the ordinary way and nothing else about your order changes. There is no penalty for finding out, and no obligation attached to asking. If spreading the cost suits you better, our financing options are straightforward, and we explain the realistic ones in our guide to financing a mattress with less-than-perfect credit. What we would not do is buy a bed you have not lain on simply because a deadline is approaching.
Your December checklist
- Confirm the plan year end date in your benefits portal.
- Write down the available balance, not the election.
- Ask whether your plan has a carryover, a grace period or neither.
- Check the health account card is in your wallet and still valid.
- Decide which condition you would be documenting.
- Book a showroom visit while there is still time to think.
- Try at least two firmness levels in your own sleeping position.
- Decide which card covers any remainder.
- Complete the eligibility step with days to spare, not hours.
- File the letter and the itemised receipt together.
Try the bed before the clock runs out
Restricted money creates bad decisions, and a mattress is a seven-to-ten-year purchase. The deadline is a good reason to stop postponing something you already need; it is a terrible reason to buy the first bed you see.
Visit the Mattress On Demand showroom in Katy, Richmond or Rosenberg before the deadline, try the beds that address the problem you are actually trying to fix, and feel the difference between two firmness levels side by side rather than guessing in December. All three showrooms carry the same full line, so go to whichever is closest: Katy, Richmond or Rosenberg. Addresses and opening hours are on our store locations page, and you can see the full payment details on our HSA and FSA page.
Frequently Asked Questions
How can I use my FSA money before it expires?
Confirm your plan year end date and your available balance, then spend it on qualified expenses incurred before that date. Prescriptions, dental and vision work are the usual answers. For a larger balance, qualifying customers may use their FSA toward a sleep purchase connected to a diagnosed condition, which is decided at checkout through a short telehealth step. You can see if you qualify before you commit to anything.
What is the last day you can use FSA funds?
The last day of your plan year, which for most plans is December 31. If your employer offers a grace period you may have up to two and a half months more to incur expenses. A run-out period is different: it extends the time to submit claims for expenses you already incurred, not the time to shop.
What if my FSA funds run out before the end of the year?
Then the account is simply spent, and anything further comes out of your own pocket as normal. You cannot top it up mid-year outside a qualifying life event. If a larger purchase still makes sense, financing is the usual route.
Do HSA funds expire at the end of the year?
No. HSA funds roll over indefinitely and the account belongs to you, not your employer. December has no special meaning for an HSA.
What happens to my HSA balance if I do not use it?
It stays where it is and carries into the next year. Many people deliberately leave it invested and reimburse themselves later; the rules allow you to pay out of pocket now and take the reimbursement whenever you choose, as long as you keep the documentation.
Can I have an HSA and a flexible spending account at the same time?
Usually not in the standard form, because a general-purpose health FSA conflicts with HSA eligibility. Some employers pair an HSA with a limited-purpose FSA, which covers dental and vision only. Your benefits portal will say which kind you have, and it is worth knowing before you plan a purchase.
What is the downside of an FSA?
The deadline and the forfeiture. You commit to an amount a year ahead, the money is tied to your employer, and the leftover generally goes away. The upside is that it is pre-tax money set aside for health expenses, which is why it is worth spending deliberately rather than letting it lapse.
Can I use my FSA on a mattress in your showroom?
Qualifying customers may, in all three of our stores as well as online, and a Certified Sleep Science Coach will take you through it on your own phone while you are there. Bring the health account card, and allow a little time before the deadline rather than arriving on the last afternoon.
Come in before the deadline
If you have a balance to use and a sleep problem you have been living with, this is the sensible few weeks to deal with both. Bring your health account card, tell us what is keeping you awake, and we will start with the beds that address it.
